import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.InputStream; 
import org.apache.http.util.EncodingUtils; 
import android.app.Activity; 
 
public class FileAccess { 
 
    /**
     * 一、私有文件夹下的文件存取（/data/data/包名/files）
     * 
     * @param fileName
     * @param message
     */ 
    public void writeFileData(String fileName, String message) { 
        try { 
            FileOutputStream fout = openFileOutput(fileName, MODE_PRIVATE); 
            byte[] bytes = message.getBytes(); 
            fout.write(bytes); 
            fout.close(); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
    } 
 
    /**
     * //读文件在./data/data/包名/files/下面
     * 
     * @param fileName
     * @return
     */ 
    public String readFileData(String fileName) { 
        String res = ""; 
        try { 
            FileInputStream fin = openFileInput(fileName); 
            int length = fin.available(); 
            byte[] buffer = new byte[length]; 
            fin.read(buffer); 
            res = EncodingUtils.getString(buffer, "UTF-8"); 
            fin.close(); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return res; 
    } 
 
    /**
     * 写， 读sdcard目录上的文件，要用FileOutputStream， 不能用openFileOutput
     * 不同点：openFileOutput是在raw里编译过的，FileOutputStream是任何文件都可以
     * @param fileName
     * @param message
     */ 
    // 写在/mnt/sdcard/目录下面的文件 
    public void writeFileSdcard(String fileName, String message) { 
        try { 
            // FileOutputStream fout = openFileOutput(fileName, MODE_PRIVATE); 
            FileOutputStream fout = new FileOutputStream(fileName); 
            byte[] bytes = message.getBytes(); 
            fout.write(bytes); 
            fout.close(); 
        } 
        catch (Exception e) { 
            e.printStackTrace(); 
        } 
    } 
    // 读在/mnt/sdcard/目录下面的文件 
    public String readFileSdcard(String fileName) { 
        String res = ""; 
        try { 
            FileInputStream fin = new FileInputStream(fileName); 
            int length = fin.available(); 
            byte[] buffer = new byte[length]; 
            fin.read(buffer); 
            res = EncodingUtils.getString(buffer, "UTF-8"); 
            fin.close(); 
        } 
        catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return res; 
    } 
 
    /**
     * 二、从resource中的raw文件夹中获取文件并读取数据（资源文件只能读不能写）
     * 
     * @param fileInRaw
     * @return
     */ 
    public String readFromRaw(int fileInRaw) { 
        String res = ""; 
        try { 
            InputStream in = getResources().openRawResource(fileInRaw); 
            int length = in.available(); 
            byte[] buffer = new byte[length]; 
            in.read(buffer); 
            res = EncodingUtils.getString(buffer, "GBK"); 
            // res = new String(buffer,"GBK"); 
            in.close(); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return res; 
    } 
 
    /**
     * 三、从asset中获取文件并读取数据（资源文件只能读不能写）
     * 
     * @param fileName
     * @return
     */ 
    public String readFromAsset(String fileName) { 
        String res = ""; 
        try { 
            InputStream in = getResources().getAssets().open(fileName); 
            int length = in.available(); 
            byte[] buffer = new byte[length]; 
            in.read(buffer); 
            res = EncodingUtils.getString(buffer, "UTF-8"); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return res; 
    } 
 
 
 
}

android txt文件读写（读取资源文件，读取私有和SD文件的方法）